It's about church planting, particularly through "cell" groups (or, like the author prefers, "shepherd" groups). Instead of expecting the "unchurched" to come to big auditoriums that are used just once a week, cell groups meet in homes in neighborhoods and are relationship-oriented. The book is cram-packed with ideas and real-life examples. The main problem I have with the book is it's overall structure: I felt like I read everything at least three times. Maybe that was intended.